Master lock 18

Master lock 18 DEFAULT

How to Crack a "Master Lock" Combination Lock

  • 1

    Turn the dial at least three rotations clockwise first, just to make sure it is clear. Turn the lock's dial clockwise to zero.

  • 2

    Apply pressure on the shackle, which is the curved handle at the top of the padlock. Turn the dial clockwise (CW) slowly as you press the shackle. If you can't turn the dial at all from the zero point, release the shackle and turn the dial CW just a number or 2 and then try it again.

  • 3

    Find the first sticking point.
    • As you turn the dial CW with tension on the shackle, you will come to the first clockwise stopping point where you can't turn the dial anymore. Make note of where it stops. Sometimes, the dial will stick right on the numbers, but sometimes the sticking point will be between the numbers. If so, record the number to the half (example: 22.5).[3]
    • While continuing to apply tension to the shackle, turn the dial as far left (counter-clockwise) as you can. Make note of the first counter-clockwise (CCW) stopping point. The CCW stopping point and CW stopping point form your sticking "range", for example, 22.5 to 10. (Note: Some 800XXX and 908xxx locks have a two number sticking range [for example, 28 to 30 and 10 to 12].)[4]
    • Determine the first sticking point by finding the number that's in the midpoint of the sticking range. A range of 4 and 5 would have a first sticking point of 4.5. A range of 22.5 and 23.5 would have a first sticking point of 23.
    • Each set of numbers that you find will have the same range. For example, one group may be 0.25 to 0.75 and another may be 0.5 to 0.25 on either side of the sticking points.
  • 4

    Release the shackle tension and turn the dial clockwise slightly past the first sticking point. Turn the dial clockwise about one number higher from the first sticking point in order to allow you to "escape" that sticking point.

  • 5

    Reapply tension to the shackle and continue turning the dial clockwise to find the rest of the sticking points. You should find 11 more sticking points, for a total of 12 sticking points in one complete turn of the dial. Write all 12 sticking points down.

  • 6

    Find the third number of the combination.
    • Look at your list of sticking points and eliminate all those which are not whole numbers (that is, cross off any number that ends in 0.5). You should eliminate 7 of the 12 numbers with this step.
    • Of the remaining sticking points, choose the number with the unique digit in the "1s" position. Four of the remaining 5 numbers will share the same number in the "1s" place, so for example, if the numbers left on the list are 4, 14, 24, 27, and 34, the number 27 is the only number which does not have a 4 in the "ones" place. This is the third number of the combination.
    • If you only have four numbers remaining and they all share the same digit in the "1s" position, check the "note" above in step 3 about a 2-number range... the third number of your combination will be the number that has a 2-number range (for example, if you have 0, 30, 20, 10 left, but 20 has a range of 19 to 21, that would mean that your third combination number is 20).
  • 7

    Find the magic number.Divide the third number of the combination (27 in this case) by four, and write down the remainder.
    • In this case 27/4 = 6 remainder 3. Remember that you are only concerned with the remainder, which will always be 0, 1, 2, or 3. If the third number of the combination is less than four, that is your magic number.
    • The remainder is the magic number. Write it down.
  • 8

    Find the possible first numbers of the combination.
    • Add 4 to the magic number (3). Write down the result (7).
    • Now add 4 to that and continue adding 4 to each resulting sum until you have gone completely around the dial once. Write down each of these numbers.
    • For the example above, the numbers would be 3, 7, 11, 15, 19, 23, 27, 31, 35, and 39. One of these numbers is the first number of the combination. (Note: For some 800XXX locks, this will be the second number of the combination. The next set of numbers will be used as the first)
  • 9

    Find the possible second numbers of the combination.If your magic number is 0 or 1, then add 2 to it. Otherwise, subtract 2 from the magic number.
    • Since the example magic number is 3, subtract 2 and get 1.
    • Write down the answer and add 4 to it. Now add 4 to each resulting sum until you have gone completely around the dial once.
    • In the example, the numbers would be 1, 5, 9, 13, 17, 21, 25, 29, 33, and 37. One of these numbers is the second number in the combination.
  • 10

    Cross out the numbers plus or minus 2 from the third number of the combination. In this example, since 27 is the third number, you can cross 25 and 29 off your list of possible second numbers.

  • 11

    Figure out the correct combination by trial and error. You now know all the possible first numbers (3, 7, 11, 15, 19, 23, 27, 31, 35, 39), all the possible second numbers (1, 5, 9, 13, 17, 21, 33, 37), and the third number (27). You've just narrowed down 64,000 combinations to only 80. Try every possible combination until you find the right one.

  • 12

    For many Master Locks, you can use the following to help figure out the first number... Apply pressure on the shackle, Turn the dial counter-clockwise (CCW) slowly as you pull the shackle. Once per rotation it should stick. Look at the number when it sticks and add 5 to that value. Find the number you wrote down for the first digit (in step 9) that is nearest the sum. For example if the lock sticks at 17 when rotating CCW, you would write down 17+5=22, then look in the list above and determine that 23 is likely the first number of the combination. [It might not work for 800XXX locks, but it's still a good starting number to try.]

  • 13

    Speed tip: You don't have to clear the lock to try each combination. You only have to clear the lock when the first or third number exceeds the second for the first time. So we would try 27-1-27, then rotate CW to 5 and CCW to 27, then CW to 9 and CCW to 27, then CW to 13 and CCW to 27, then CW to 17 and CCW to 27, then CW to 21 and CCW to 27, *now that the next number we would try is 33 which is greater than our first digit we would try 27-33-27, then CW to 37 and CCW to 27. The reason this works is the disk for the second digit isn't impacted when we rotate CCW, so we are effectively just setting the 2nd number to a bigger value. When the value gets too big then we effectively passed the first number *twice* and then picked our second digit -- which is why we have to reset when the 2nd number becomes bigger than the first.

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    Master Lock

    American lock company

    Master Lock is an American company that develops padlocks, combination locks, safes, and related security products. Now a subsidiary of Fortune Brands Home & Security, Master Lock Company LLC was formed in 1921 by locksmith-inventor Harry E. Soref and is headquartered in Oak Creek, Wisconsin.[1][2][3] In 1970 the company was purchased by American Brands from Soref's heirs. American Brands was later renamed to Fortune Brands, which then split on October 3, 2011, to create the Fortune Brands Home & Security company and the beverages company Beam Inc. (which was then soon purchased by Suntory).

    Early company history[edit]

    Before co-founding the company in 1921, Harry Soref had been a traveling locksmith in the U.S., Canada, and Mexico,[2][3] had invented a lock for protecting military equipment,[3] and had founded the "Master Key" company for making master skeleton keys.[2] In 1919, Soref then invented a padlock design that used laminated steel layers to economically produce an exceptionally strong lock body.[3]

    He tried unsuccessfully to get some large companies interested in using his design, so he and two friends—P. E. Yolles and Sam Stahl,[4]—worked together to found the Master Lock company in Milwaukee in 1921 to produce the locks themselves, initially with five employees.[2][3] In 1924, the company was granted the first patent on such a laminated lock design.[3] Stahl led the company to become a major manufacturer of locks and the three co-founders worked closely together until Soref's death in 1957.[5] However, the brand had not yet reached its peak status as a familiar consumer brand at the time of Soref's death.[3] Stahl led the company until selling his shares to Soref's children who took over the company management, later selling the company to the American Brands Corporation in 1970.[4]


    In 2002, Master Lock released its Titanium Series of padlocks, the first major redesign in fifty years. The goal was to add design variety and aesthetic value to the utilitarian functionality of their locks. The lock mechanism has titanium reinforced steel, with a stainless steel body. A shroud covers parts of the stainless steel, allowing the locks to come in different colors.[6] Master Lock requested that the designer locks be stocked in departments outside the hardware section of retailers.[7] The design received an Industrial Design Excellence award from Business Week in 2002.[8]

    In 2003, the company acquired Illinois based American Lock and all their intellectual and material property.[9]

    In 2010, Master Lock began offering a password manager service called Master Lock Vault that includes a web site and associated software applications for use on various devices.[10] In 2011 Fortune Brands spun off Master Lock as part of Fortune Brands Home & Security.[11]

    In 2012, Master Lock introduced a line of combination padlocks called the dialSpeed.[12] The dialSpeed lock is battery-operated, has a lit face, and features multiple user-programmable combinations. It has a master unlocking code that can be accessed through the company web site.[12] The product won a 2011 silver Edison Award.[8]

    In 2014, Master Lock acquired SentrySafe for $117.5 million.[13] New products in the 2000s moved beyond locks, such as industrial space cover sealing mechanisms.[14] Distribution of Master Lock products occurs through wholesale distributors that supply the locks to individual retailers.[15] Locks are made for a variety of uses, including personal locking, vehicle locking, and others.[16]

    Tough Under Fire ad[edit]

    In 1974, Master Lock ran a Super Bowl ad demonstrating one of their locks withstanding a shot by a sharpshooter, thereby proving its durability and thus their slogan "Tough Under Fire". Master Lock continued running similar ads during future Super Bowls, spending almost their entire annual marketing budget on the single commercial.[17] Later, Master would incorporate the image into a one second-long blipvert commercial in 1998.[18]

    Offshoring and re-shoring[edit]

    At its peak in the early 1990s, the company employed about 1,300 workers in the Milwaukee, Wisconsin area.[1][19] In 1993, the company began moving much of its manufacturing to China, and later also moved some manufacturing to Mexico.[1][19] Most of the jobs at its Milwaukee plant were eliminated, although the company continued to perform some of its manufacturing at the plant using heavily automated manufacturing processes.[1]

    In January 2011, it was announced that about 36 jobs were being returned from China to the Milwaukee plant, which would increase the number of positions at the plant to 379.[1][19] Most of the added jobs were for making combination locks, subassemblies and keys.[1] It was reported that the company would also continue to contract with three Chinese factories and about twenty Chinese suppliers, and operate its maquiladora near the Arizona border, where Mexican workers perform non-automated labor-intensive work such as assembling made-in-Milwaukee components.[1][20]

    In February 2012, U.S. President Barack Obama visited the Master Lock headquarters in Milwaukee, Wisconsin and lauded the company's recent return of jobs from overseas locations.[21] As of that time, it was reported that the company had returned about 100 jobs from overseas during the preceding two-year period.[21]

    • Master Lock padlocks
    • A Master combination padlock.

    • Master lockbox for key storage.

    • Master 175 combination lock


    1. ^ abcdefgSchmid, John, Master Lock reassessing China: Milwaukee-based company finds it can compete better from U.S. soil, Milwaukee Journal Sentinel, Jan. 1, 2011.
    2. ^ abcdHarry E. Soref, Archived March 6, 2011, at the Wayback Machine Univ. Wisconsin Milwaukee Sheldon B. Lubar School of Business.
    3. ^ abcdefgAlfred, Randy (March 2, 2011) [March 2, 2009]. "March 2, 1887: Birth of the Master Locksmith". Wired. Retrieved August 3, 2017.
    4. ^ abMaster Lock Company History, Funding Universe,
    5. ^Hutzel, T.; Lippert, D. (2014). Bringing Jobs Back to the USA: Rebuilding America's Manufacturing through Reshoring. CRC Press. p. 59. ISBN . Retrieved 2017-02-23.
    6. ^Lidwell, W.; Manacsa, G. (2009). Deconstructing Product Design: Exploring the Form, Function, Usability, Sustainability, and Commercial Success of 100 Amazing Produ. Rockport Publishers. p. 188. ISBN . Retrieved 2017-02-23.
    7. ^Cheryl Dangel Cullen, L.H. Design Secrets : Product 2. Rockport Publishers. p. 126. ISBN . Retrieved 2017-02-23.
    8. ^ abSpinelli, S.; McGowan, H. (2013). Disrupt Together: How Teams Consistently Innovate. Pearson Education. p. 247. ISBN . Retrieved 2017-02-23.
    9. ^"History of American Lock". American Lock. Archived from the original on 2010-05-10. Retrieved 2019-05-05.
    10. ^"Password Manager for iPhone, Android & Desktop | Master Lock Vault". Retrieved 2017-02-23.
    11. ^"milwaukee/print-edition/2011/11/11/master-lock-to-benefit-from-spinoff". Retrieved 2017-02-23.
    12. ^ abMaster dialSpeed 1500EDBX Padlock Review, Gadget Review, August 23, 2012.
    13. ^"Sentry Safe sold to Master Lock for $117.5M". Retrieved 2017-02-23.
    14. ^"Master Lock | 2015-05-29 | Safety+Health Magazine". Retrieved 2017-02-23.
    15. ^Rosenbloom, B. (2012). Marketing Channels. Cengage Learning. p. 231. ISBN . Retrieved 2017-02-23.
    16. ^Dickison, Dan (2006). Powerboat Reports Guide to Powerboat Gear: Take the Guesswork Out of Gear Buying. ISBN . Archived from the original on 2015-07-02. Retrieved 2015-07-01.
    17. ^Blankenhorn, Dana, Advertising During the Super Bowl: A Mixed Bag, ClickZ Marketing News & Expert Advice, Jan. 23, 2001.
    18. ^Christopher, Alistair, Blink Of An Ad, Time, Aug. 3, 1998.
    19. ^ abcAhmed, Beenish, Some Jobs Finally Return at Master Lock, United Auto Workers, Jan. 24, 2011.
    20. ^Ahmed, Beenish, Local 469 workers have right combination for more jobs at Master Lock: "Re-sourced" work from China returns to Milwaukee plant, United Auto WorkersSolidarity, Mar./Apr. 2011.
    21. ^ abGarcia, Jon, Obama Trip to Lock Factory Evokes Smelly High School Gym Memories, ABC News, Feb. 15, 2012.

    External links[edit]


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